How to set selected item of RibbonMenuButton item in WPF Ribbon Control Library

Hai,

I am using WPFbon control library in my application . I have created a RibbonMenuButton and binded a list to its ItemSource .The Problem is i cant set any of these items as selected (to get selected item/index). There seems to be no property in this control which allows me to do this.

 Any help on this is appreciated.

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Thanks,

Revathi